US3153676A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of naphthalene and 2, 6-dimethylnaphthalene
Assignee: Sunoco Inc
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Filing: 1961-06-27
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Granted: 1964-10-20
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Expires: 1981-06-27
Abstract
No abstract record available.
Inventors
- 👤 Joseph G Allen
- 👤 Earl W Malmberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:19
CPC Classifications
C; C07; C07C; C07C15/00; C07C15/20; C07C15/24; C07C15/02; C07C15/04; C07C4/00; C07C4/08; C07C4/12; C07C4/14; C10; C10G; C10G2400/00; C10G2400/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
143 words
IN A PROCESS INVOLVING HYDRODESULFURIZING A GAS OIL FRACTION BOILING MAINLY IN THE RANGE OF 440-525* F. AND CONTAINING MAINLY MONOCYCLIC AND CICYCLIC AROMATIC HYDROCARBONS INCLUDING MONOMETHYL AND DIMETHYLNAPTHALENE, SEPARATING FROM THE DESULFURIZATON PRODUCT MATERIAL CONTAINING ALKYLNAPHTHALENE AND SUBJECTING SUCH MATERIAL TO A DEALKYLATION REACTION AT A TEMPERATURE ABOVE 1000* F. TO PRODUCE NAPHTHALENE, THE STEPS FOR RECOVERING 2,6DIMETHYLNAPHTHALENE AS AN ADDITIONAL PRODUCT WHICH COMPRISES: (1) SEPARATING FROM SAID DESULFURIZATION PRODUCT A FRACTION BOILING ESSENTIALLY IN THE RANGE OF 500-510*F. AND COMPOSED OF A MAJOR PROPORTION OF DIMETHYLNAPHTHALENE HAVING THE METHYL GROUPS ON OPPOSITE RINGS OF THE NAPHTHALENE NUCLEUS AND MINOR PROPORTIONS OF ETHYLNBAPHTHALENE AND DIMETHYLNAPHTHALENE HAVING METHYL GROUPS ON THE SAME RING OF THE NAPHTHALENE NUCLEUS; (2) CHILLING SAID PRODUCT TO A TEMPERATURE SUFFICIENTLY LOW TO CRYSTALLIZE MOST OF THE 2,6- AND 2,7-DIMETHYLNAPHTHALENE; (3) SEPARATING A FILTRATE ENRICHED IN ETHYLNAPHTHALENE FROM THE
Claim 2
Dependent Claim
143 words
IN A PROCESS INVOLVING HYDRODESULFURIZING A GAS OIL FRACTION BOILING MAINLY IN THE RANGE OF 440-525* F. AND CONTAINING MAINLY MONOCYCLIC AND CICYCLIC AROMATIC HYDROCARBONS INCLUDING MONOMETHYL AND DIMETHYLNAPTHALENE, SEPARATING FROM THE DESULFURIZATON PRODUCT MATERIAL CONTAINING ALKYLNAPHTHALENE AND SUBJECTING SUCH MATERIAL TO A DEALKYLATION REACTION AT A TEMPERATURE ABOVE 1000* F. TO PRODUCE NAPHTHALENE, THE STEPS FOR RECOVERING 2,6DIMETHYLNAPHTHALENE AS AN ADDITIONAL PRODUCT WHICH COMPRISES: (1) SEPARATING FROM SAID DESULFURIZATION PRODUCT A FRACTION BOILING ESSENTIALLY IN THE RANGE OF 500-510*F. AND COMPOSED OF A MAJOR PROPORTION OF DIMETHYLNAPHTHALENE HAVING THE METHYL GROUPS ON OPPOSITE RINGS OF THE NAPHTHALENE NUCLEUS AND MINOR PROPORTIONS OF ETHYLNBAPHTHALENE AND DIMETHYLNAPHTHALENE HAVING METHYL GROUPS ON THE SAME RING OF THE NAPHTHALENE NUCLEUS; (2) CHILLING SAID PRODUCT TO A TEMPERATURE SUFFICIENTLY LOW TO CRYSTALLIZE MOST OF THE 2,6- AND 2,7-DIMETHYLNAPHTHALENE; (3) SEPARATING A FILTRATE ENRICHED IN ETHYLNAPHTHALENE FROM THE
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-10-20 | 1968-04-20 | 1968-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-10-20 | 1972-04-20 | 1972-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-10-20 | 1976-04-20 | 1976-10-20 | $7700.00 | Window Closed / Lapsed |